john mccain the original sponsor of the bill now denounces his own hanley work. will it's hope in the post election atmosphere this dynamic can change and mccain can proudly support his very own bill. let me close by saying i do think america is exceptional. it is the global melding pot, a place where the universal nation is being created. we may not do better in immigration than anyone before but we do assimilation better than anyone. people from all over the world come to this country and almost magically become real americans but part of being a real american is urging the country to look at its flaws and change them. let's get started. >>> as president obama readies for a second term, i wondered who could best shed light on the challenges he faces and how to deal with them. the president is an avid student of american history so i thought it was fitting to ask two great pulitzer prize-winning historians to sit down with me. robert carroll has written four biographies and jon meacham has a new book out on a twice elected president. the book is called "thomas j